Fin Cartwright joined the Mariners on a season-long loan from Championship side Middlesbrough on deadline day in summer 2026.
The 19-year-old midfielder joins the Mariners having spent his entire youth career with Middlesbrough, progressing through the club’s academy after joining at Under-7 level.
Born in Redcar, Cartwright made his senior and professional debut for Boro in August 2023, coming off the bench in a 3-2 Carabao Cup victory over Huddersfield Town at just 16 years and 161 days old.
That appearance made him the second-youngest player to represent Middlesbrough in a competitive fixture.
Cartwright has also represented England at Under-16 and Under-17 level, earning nine youth international caps.
The central midfielder has continued his development with Middlesbrough’s academy and was a regular for the club’s Under-21 side during the 2025/26 campaign, making 12 Premier League 2 starts and contributing two assists.
